Speed governor



May l5, 1928'- 4, 1925 2 sheets-sheet 1 J. P. HARRISON, JR

SPEED GOVERNOR Filed March 2 v lll.

lill Patented May l5, 1928.`

JOHN P. 'HARRSON, JR., 0F VERSAILLES, INDIANA.

ysrnnn GOVERNOR.:

Application filed March 24,- 1923. Seia1Nof627A86. f

My invention relates toi speed governors for internal combustion engines primarily, although it is applicable to any typeof enine; i

g In the use of motor tractors especially in farm work, it is desirableto have a speed governor, because the farmer often' uses` his tractor engine asv a stationary len'ginefor drivingvarious'kinds off'machinery. is also valuable to have a governor under any ci1`cumst 'an ces where a motor vehicle is doing work as` a tractor orf running "alone under lits own power, to controlfthe'speed at 'which l the"engine can goy under predetermined conditions.

It' is the object of myV invention to supply a governor"'which shuts oi'the throttle 'of an' 'internal combustionengine or in other engines, and cuts down the applicationof powerinsuch a way that 'a speed predetermined by a setting 'of 'the'governorjwill'be maintained.

device includes" among other features a compensation for variationsv in speed due toA sudden loads of'shortdurationl Thusat the moment of sudden inadequacy of power, the governor exhibits a tendency to resista vsud'dei'r stopping of; the engine, by` ,a cammed movement toward full power application po-k sition. y I- My device has alsothe feature vthat' it may be set to ywork from a wide variation o fpositions, so thatv theengineer `can determine what power he requires 'tooperate under a load knownftohim, and set his` throttle at a selected'point, whereupon the governor act to maintain the speed for which it; is 'set under said load'."

I accomplish my object thatcertain constructionand arrangement of parts to be hereinafter more specifically pointedout and claimed.

In thedrawings: Figure 1 isl a section taken centrally through the governor. Y

Figure 2 is a 'top planfview thereof with the casing of the pulley removed and the shaft in section; Figure l3 isa perspectivefview of the'assembly during theloperation of "they engine. Figure'4 is a like viewoffagovernor arm; Figure 5 is a perspectivev view/showing theconnections of 'the governor with the throttle valve of an internal combustion engine, illustrating the method adopted by me of "setting/the governor action at various base positions "of the throttle valve.`

Referring to the governor device, aside from its connection, I show a pulley 1, which represents)` any driven member, deriving power from lthe engine. y'This pulleyiv is mounted onv a bushing 2,which`is rotatably 'held' by the nut 3a in a bracket '3, which fis secured immovably to some part-of the "en-- vgine or vehicle frame; 'Within'the bushing is a shaft r,whi'ch terminatesy withinithe 'pulley at one end, and at the; other end terminates in a grooved collar 5,within which rides the roller 6 of a bell cranlnlevern?. The' rotation of theshaft 4L doesnotmove rockthe lever and through `its"connections .70 ythe lever, but an endwise `thrust uheretowill will move the throttle.I valve of the engine. I

The range vof movement of' thislshaftfneed f notbegreat in the embodimentshown;

' Mounted on the insideE of the pulley i. e. on what maybe termed the cover 8,`is "a 'postQ'carrying 1a radially projecting stud 10.l lOver this post is. arranged La collar 11, having a cam groove 12 therein 'through which the stud passes.' collar is the governor arm carrier lhaving earsk 14E for the two weight' carriershllia.

Pins'l in 4these weight carriers are mounted in the ears', 'androllersl onv the lends of the Secured asttogthis arms" (four. rollers' Yin number) f engage.A yin on the shaft 4.

,groovesY 17 in a n inverted4 Ushaped piece i Thumb@ aaai 'is eaeawah the piecev 18, which lies within' 'thexpnllevv but 'isy not connected" with the weight `carrier nor .the

post `or collar above describedV except through the engagement of the yrollers 16 in the 'groovesfo'rmed in -t-hetwo depending sides-'ot saidvpiece l18.` When the weights swing outwalfdly under the iniiuence" of 'centri'fugal force' the piece v 18, which rotates along with the pulley', is carried aroundfby the roller-engagementy with 'the weight carrie'rs,"` then moves Alengthwise carrying the shaft 4 into 'anhang-ed relation'wth the bell crank leverthat controls the throttle 4'movingsy stemtobe described; Y Y e The'weights 19 are 'set inthe weight carriore, and springs 20,20, arefsecured in lugs 21 formed 4von 'the lower ends of the arms.

When thep'ulley is in rotation thegove'r'= norl arinsiiyoutw'ardly which movement pulls down on the bell crankk abovenoted. When the engine suddenly slows down, the

pulley tends to slow up also, but this slowing up of the pulleyholds back on the post and stud that are secured fast thereto, and

the governor tends to keep on rotating, with the'result that the cam` groove will shift inA its engagement with the stud carrying the entire governor arm vcarrier lengthwlse (of the shaft 4), which moves the shaft 4 up wardly in the opposite direction from that impressed by the rollers onk the governor arms, vas they fly outwardly on their support. A p y This action thus tendsfto open the engine throttle, with the result of a compensation and` steadying of the action of the governor. g The actionA of this compensating device is valuable in steadying the action'of the device vvhen a suddenclo'ad is applied to the engine. This load will at once slow up the action of the governor operating pulley with the consequent sudden advancement as just described yof the governor device to a wider openthrottle position, therebyl taking care jof this sudden load, by the admission of .more fuel to the engine.

The connections of the governor operated bell crank with the throttle as illustrated comprise a link between the bell crank vso and the arm '31 on a shaft 32, which shaft is mounted on ra bracket 8,3. has an arm 34, connected by means of a' link withv the rlever 36. This lever l36 is mounted on a stud 37, which stud is held falso lon a lever 38. The lever 38 is moved by means of a hand control 39 secured to a shv'aft'40, which lshaft 40 has the lever 38 operator `to move the yhand control lever) thereby shifting the lever 36 on its vfulcrum 45 i. e. the point of engagement with the train of levers from the governor. This will opener close the throttle, leaving itl at some predetermined position. f

VVhen'tlie engine is started upfand the governor device overcomes the pull of the springs thereon, and the weights move Out- `vvardly and pull down on the bell crank lever element, the result willy be that the lever. 86 will be rocked on its fulcrum of engagement with thehand operated system, i. e. on the Stud37, and will exert a closing movement on the'throttlevalve.y ,l

Thus in using va tractor engine for cutting fodder, the operator will know where to set his hand system, so that vthe throttle will permit a desired speed of the engine under the load of cutting fodder. When this load isnot beingffully used the engine tends to speed up and thegovernor shuts :down the throttle. When the load is suddenly applied, or the speedv of the engine suddenly slovvs down, the governor willso open position. If, the hand position governorwill when fully extended, fail to cut down the speed for whichk its weights .act as. to move the throttle towardv a wider Aand springs are set, lthe usefulness'of Vthe governor .will be limited to its action under sudden.L deceleration. governor will operate to closethethrottle as the speed risesandjopen it as the speed falls.

It `will'beevident that I have merely d escribed one setof devices whichwill accom# plish the objectof my invention, and I desire myclaims that follow tobe taken as set-A is Such that the Below this'limity the tingforth what I conceive. tobe the invention inherent in myl device without' intending that the particular l.set of details above .describedserveas limitations to theconstructionvof said claims. y

Having thus describe/d my invention, what I claim as new andy desire to secure byv Lettersy Patent, is

l. A. governor device comprisinga rotary engine driven member, a governor arm carrier having arms thereon ythat are connected to a throttle valve element ofl an engine, andv connection between the governor arm carrier andthe lrotary member, comprising va collar with'v a cam slot on thei'one member and a stud on the other','so arranged 'that upon the sudden slowing down of the ro-` tary member the slot and stud will operate Ito move the governorarm carrier inl a direction opposedto the lmovement ofthe governor arms in their' connection tothe throttle valve element, thereby opening said throttle valve. l i f 2. A governor devicecomprising a rotary member, `a-post thereon having a stud projecting therefrom, a collar ymounted loosely overy said post and having a cam groove engaging said stud, governor arms on the collar, a shaft having connection with the 4governor arms independentof the collar,

and having also connection with a throttle valveelement of thejk engine, and said'cam so arranged that the sudden slowingof the rotary member will move the collar in a di` rection ,to increase the accelerating movement ofthe governor arms at their pointof connection with said shaft, thereby opening said throttle valve;

' V JOHN P. HARRISON, JR. 

